Effect of moisture on concrete damage and aggregate recycling under microwave irradiation

被引:13
|
作者
Pengju, Zhang [1 ,3 ]
Wei, Wei [2 ,3 ]
Zhushan, Shao [1 ,2 ,3 ]
Rujia, Qiao [2 ,3 ]
机构
[1] Xian Univ Architecture & Technol, Sch Civil Engn, Xian 710055, Peoples R China
[2] Xian Univ Architecture & Technol, Sch Sci, Xian 710055, Peoples R China
[3] Shaanxi Key Lab Geotech & Underground Space Engn, Xian 710055, Peoples R China
来源
JOURNAL OF BUILDING ENGINEERING | 2022年 / 46卷
基金
中国国家自然科学基金;
关键词
Microwave irradiation; Concrete; Moisture content; Microstructure; Heating effect; CONSTRUCTION; DURABILITY; KINETICS; ENERGY; CEMENT;
D O I
10.1016/j.jobe.2021.103741
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Microwave-assisted concrete aggregate recycling is a novel green technology, which causes less pollution and generates low energy during heating. This study aimed to explore the influence of moisture content on the heating process of concrete as well as its strength under microwave irradiation. Interfacial debonding of aggregate and mortar after the microwave irradiation was analyzed. Through a uniaxial compression experiment, the compressive strength of test blocks with different moisture contents is gained after microwave irradiation. The changes of microstructure are obtained using Scanning Electron Microscopy analysis. The results demonstrated that microwave power and moisture content were two important factors affected the concrete breaking. When the moisture content of the test block is relatively high, the concrete will break with a short irradiation time and low temperature under a high microwave power input. The aggregate-mortar interface separation was evident, and intact aggregates with low mortar adhesion could be picked out from the crushed concrete. In this study, we provided a reference for further development of microwave-assisted concrete recycling technology.
引用
收藏
页数:15
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